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From: Andrey Melnikov (melnikov_at_[hidden])
Date: 2005-08-16 07:22:59

David Abrahams wrote:
> Andrey Melnikov <melnikov_at_[hidden]> writes:
>>David Abrahams wrote:
>>>Andrey Melnikov <melnikov_at_[hidden]> writes:
>>>>Also we cannot rely on the registry even for MSVC because private
>>>>installations don't use it.
> What's a "private installation?" An installation "for this user only?"

Initially I doubted that user-config is useful for most users. I
suggested site-config to be used for toolset configurations.

A "private installation" is an installation which cannot/shouldn't be
set up in the site-config.

>>>Nobody mentioned *relying* on it. The user's explicit configurations
>>>will always take precedence.
>>By "relying" I mean cancelling the old autodetection method using
>>environment variables. We cannot cancel it because the registry still
>>can fail.
> IMO we can cancel any auto configuration we want, since there is
> always manual configuration. It may not make sense to support the
> complexity of two autodetection mechanisms.

I agree. I just mean that we should cancel the registry. See the
(doubtful) rationale below.
>>With default VS installations the environment always work. In specific
>>cases both environment and registry fail. Now I doubt that we should use
>>registry autodetection. It isn't less fragile than the environment.
> IIUC even non-default VS installations set the registry.

Yes. The only scenario when registry autodetection breaks is if user
uses VS command-line tools without an installation. Vladimir showed that
it was possible.

> The
> installer gives you the option to *not* set up the environment, so I'd
> think the registry would be the more reliable of the two.

I thought that if you don't setup the environment the installer just
doesn't setup INCLUDE/LIB persistently. IMO VS*COMNTOOLS is always set up.

If I'm right in my assumption about COMNTOOLS, I think that the registry
offers no advantages over the environment. For example, in case of
Vladimir user would be afraid of setting the registry but setting the
environment is ok.



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